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Measurement of streamwise vorticity fluctuations in a turbulent channel flow

Published online by Cambridge University Press:  20 April 2006

Elefterios G. Kastrinakis  and
Helmut Eckelmann
Elefterios G. Kastrinakis
Affiliation:
Max-Planck-Institut für Strömungsforschung, Göttingen, West Germany Permanent address: Department of Chemical Engineering, Institute of Technology, University of Thessaloniki, Greece.
Helmut Eckelmann
Affiliation:
Max-Planck-Institut für Strömungsforschung, Göttingen, West Germany
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Abstract

In a fully developed turbulent channel flow, measurements of the streamwise vorticity fluctuations ωx have been made. A newly designed probe provides simultaneously in addition to the vorticity signal all three velocity signals. The new probe bears a likeness to the Kovasznay-type vorticity probe, but consists of four electrically independent hot wires, each mounted separately on a total of eight supporting prongs. A new calibration technique had to be developed for this probe.

In addition to various statistical properties of the three velocity components, the distributions of vorticity fluctuations and of skewness and flatness factors are given up to wall distances as close as y+ = 19. A pronounced maximum of the streamwise vorticity fluctuations was found at y+ ≈ 20. Large values of the flatness factor characterize the outer flow region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 137 , December 1983 , pp. 165 - 186
Copyright
© 1983 Cambridge University Press

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